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Resolved Update: apparently cat cannot write to /etc. Resolved by using:

sudo tee /etc/apt/sources.list.d/mozilla.sources <<eof types: deb uris: https: packages.mozilla.org apt suites: mozilla components: main signed-by: etc keyrings packages.mozilla.org.asc eof p></eof>

The instructions need updating!

_________________original problem (in case some one else needs the information)

I am following the instructions in section "Install Firefox from Mozilla Repository (Recommended)" at https://support.mozilla.org/en-US/kb/run-firefox-chromeos At step 4 I am receiving a permission denied error: "-bash: /etc/apt/sources.list.d/mozilla.sources: Permission denied" I am not sure how to resolve or continue.

Last command and output:

username@penguin:~ cat <<EOF > /etc/apt/sources.list.d/mozilla.sources Types: deb URIs: https://packages.mozilla.org/apt Suites: mozilla Components: main Signed-By: /etc/apt/keyrings/packages.mozilla.org.asc EOF -bash: /etc/apt/sources.list.d/mozilla.sources: Permission denied

I followed the advise and removed all the profiles from my laptop. (Copies are on an external hard drive.) And I used the download file from the Mozilla community site which is 490 KB versus the 375 KB download file from firefox.com just in case the smaller file was corrupted. But I still got the Profile Missing error message.

I am trying to simulate a laptop that has never used Firefox and so can't say that "Your Firefox profile cannot be loaded.  It may be missing or inaccessible."  I uninstalled Firefox using the Installed Apps page. Can there be fragments of Firefox that I need to hunt down and remove? I also removed the Old Firefox Data folder from the desktop.

How can I successfully install Firefox? Then I will use my old profiles that contain all my bookmarks.

bold textI downloaded fire fox but don't see it listed with my other browsers, why? i downloaded fire fox but it's not listed among my browsers, why?

The full winget command is: ```pwsh winget install --id Mozilla.Firefox.zh-CN -s winget -e -i -l D:/.../Mozilla/Firefox/ ```

The winget log mentioned that winget downloaded https://download-installer.cdn.mozilla.net/pub/firefox/releases/150.0.2/win64/zh-CN/Firefox%20Setup%20150.0.2.exe ```log 2026-05-12 22:19:28.840 [CORE] WinINet downloading from url: https://download-installer.cdn.mozilla.net/pub/firefox/releases/150.0.2/win64/zh-CN/Firefox%20Setup%20150.0.2.exe 2026-05-12 22:37:42.091 [CORE] Download hash: 6c7fb833ebb13637daf750c7a2c611e2b6d8d324dc2463eed40e8478d0c791fc 2026-05-12 22:37:42.091 [CORE] Download completed. 2026-05-12 22:37:42.094 [CLI ] Installer hash verified ```

Installer args: ```log 2026-05-12 22:37:43.543 [CLI ] Installer args: /InstallDirectoryPath="D:/.../Mozilla/Firefox/" 2026-05-12 22:37:43.545 [CLI ] Starting: 'D:\Temp\WinGet\Mozilla.Firefox.zh-CN.150.0.2\Firefox%20Setup%20150.0.2.exe' with arguments ' /InstallDirectoryPath="D:/.../Mozilla/Firefox/"' 2026-05-12 22:38:12.554 [REPO] Reading MSI UpgradeCodes 2026-05-12 22:38:12.891 [REPO] Reading MSI UpgradeCodes 2026-05-12 22:38:13.405 [CLI ] During package install, 1 changes to ARP were observed, 1 matches were found for the package, and 1 packages were in both 2026-05-12 22:38:13.405 [CLI ] The entry determined to be associated with the package is 'Mozilla Firefox (x64 zh-CN)', with publisher 'Mozilla' ```

Then winget shows the installation was successful, but the shortcuts in the Start menu and on the desktop point to a path that doesn't exist. I noticed that this path is the one I passed to winget via the -l parameter, but it is missing the slash (`/`) > D:/a/b/Mozilla/Firefox/ → D:\abMozillaFirefox\ I couldn't find the installed Firefox either in the root directory of drive D or under the originally expected path D:\...\Mozilla\Firefox.

Although I passed the -i parameter (specifying interactive installation) to winget, I didn't see the installer window. In the user registry, the installer also wrote the aforementioned incorrect path, and I cannot uninstall this installation through Windows Settings.

I wrote a script myself to search for folders or files with 'firefox' in the name (case-insensitive) on my system's C and D drives, and I only found this folder that looks related: ```pwsh > ls "C:\Users\...\AppData\Roaming\Mozilla\Firefox"

   Directory: C:\Users\...\AppData\Roaming\Mozilla\Firefox

Mode LastWriteTime Length Name

d---- 2025/11/23 18:05 Background Tasks Profiles d---- 2025/12/24 18:47 Crash Reports d---- 2025/11/23 18:05 Pending Pings d---- 2025/11/23 18:06 Profile Groups d---- 2025/11/23 18:06 Profiles -a--- 2025/12/27 8:43 75 installs.ini -a--- 2025/12/27 8:43 482 profiles.ini ``` But based on the LastWriteTime, this seems to have been left when I previously installed Firefox.

I want to know what the installer does after running the above installation, and how I can undo these changes to reinstall Firefox?

> Note: English is not my native language, please forgive my spelling or grammar mistakes. > I originally wanted to post on a Chinese forum, but I was guided here...

As my title says i cant move Firefox from desktop because it is *the* browser file not a shortcut, and every time i try to move it to any different folder it just creates a shortcut in said folder. I asked Copilot how to reinstall it, set it in actual search mode so i could have 100% reliable steps, nothing worked! >:ε

so im asking yall if there is a way to fix it, thanks in advance